Apologies for the issues. I am not sure what is the root cause of this, but I suspect you may need to start the deployment over and make sure you configure everything exactly how our docs detail.
I gut feeling is that there is a small piece missing to the set up steps and I can't really troubleshoot until I can see your code and deployment config set up. I would just be asking you line by line as I read through the docs as well.
Which docs are you referring to when you say it is not obvious? We can look into improving them if you can direct me some specific areas that you are not sure about. Make sure you follow all the steps in the docs here.
Also it looks like you tried to upload a PNG but it is only showing a thumbnail icon, if you can share some screenshots that could be very helpful for getting help from other users who have also completed this set up.